[NTG-context] Re: incosistent output of --- dash

[Hans Hagen <j.hagen@xs4all.nl>]

On 4/6/2024 1:38 PM, Wolfgang Schuster wrote:
> Henning Hraban Ramm schrieb am 06.04.2024 um 12:23:
>> Am 06.04.24 um 11:43 schrieb madiazm.eoicc@gmail.com:
>>> Hi everyone,
>>> I'm a bit puzzled because I usually don't get an em-dash when I type 
>>> tree hyphens. If I use the command \emdash, no problem but when I use 
>>> the hyphens some days it works... and somedays I see three small 
>>> hyphens.
>>> I tried it on overleaf and of ContextOnWeb with the same 
>>> inconsistency. If I create a new file it usually works right; but 
>>> when I overwrite an existing file subtituting a hyphen for three 
>>> where the dash should be I sometimes get it right and sometimes wrong.
>>> It is not the pdf viewer since I get good or bad results in all, the 
>>> overleaf pdf preview tool, the context on web preview tool and the 
>>> mozilla integrated pdf viewer.
>>>
>>> Am I missing something on the use of this ligature? (the question is 
>>> just out of curiosity, since I plan to create a command that adds a 
>>> hairspace after or before the dash, since I don't like it to stick to 
>>> some letters like "o".
>>
>> Generally, “we” try to reduce active characters as much as possible, 
>> that’s why -- and --- usually /don’t/ produce en or em dashes. You can 
>> activate these ligatures as a font feature though (AFAIR 
>> "latexhyphens", can’t find it…).
> 
> The name of the option has changes a few times and the current setting 
> is textcontrol=collapsehyphens.
> 
>> Some editors and some fonts do automatical replacements.
> 
> In this case it could be the wrong symbol in the document, there are 
> many dashes in unicode which look similar in the input and output files.
> 
> \starttext
> 
> \startbuffer
> \starttabulate[|T||||]
> \NC U+0002D \NC - \NC -- \NC --- \NC\NR
> \NC U+02011 \NC ‑ \NC ‑‑ \NC ‑‑‑ \NC\NR
> \NC U+02012 \NC ‒ \NC ‒‒ \NC ‒‒‒ \NC\NR
> \stoptabulate
> \stopbuffer
> 
> \getbuffer
> 
> \setupbodyfont[pagella]
> 
> \getbuffer
> 
> \stoptext
detail: it is not a real fontfeature (as tlig in mkiv) but implemented 
differently with a bit more control, so we have

\nohyphencollapsing
\dohyphencollapsing

etc too as control options. These collapsed hyphens are also configured 
as valid hyphenation chars.

Hans


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